Influence of Gold on Ce-Zr-Co Fluorite-Type Mixed Oxide Catalysts for Ethanol Steam Reforming

Catalysts

Julio Cesar Vargas²  Svetlana Ivanova⁴  Sstien Thomas¹  Anne-Cຜile Roger³ 

[1] Laboratoire Catalyse et Spectrochimie, ENSICAEN, Université de Caen, CNRS, 6 Boulevard Maréchal Juin, Caen Cedex 14050, France;Departamento de Ingeniería Química y Ambiental, Universidad Nacional de Colombia, Ciudad Universitaria, Avenida Carrera 30 No. 45-03, Bogotá Edificio 453, Colombia;Laboratoire des Matériaux, Surfaces et Procédés pour la Catalyse, ECPM, Université de Strasbourg, CNRS, 25 rue Becquerel, Strasbourg Cedex 2-67087, France;Instituto de Ciencia de Materiales de Sevilla, Centro Mixto Universidad de Sevilla—CSIC, Avenida Américo Vespucio, N° 49, Isla de la Cartuja, Sevilla 41092, Spain;

关键词: ethanol steam reforming;    hydrogen;    gold;    cerium-zirconium-cobalt mixed oxides;   

DOI  :  10.3390/catal2010121

来源: mdpi

【 摘 要 】

The effect of gold presence on carbon monoxide oxidation and ethanol steam reforming catalytic behavior of two Ce-Zr-Co mixed oxides catalysts with a constant Co charge and different Ce/Zr ratios was investigated. The Ce-Zr-Co mixed oxides were obtained by the pseudo sol-gel like method, based on metallic propionates polymerization and thermal decomposition, whereas the gold-supported Ce-Zr-Co mixed oxides catalysts were prepared using the direct anionic exchange. The catalysts were characterized using XRD, TPR, and EDXS-TEM. The presence of Au in doped Ce-Zr-Co oxide catalyst decreases the temperature necessary to reduce the cobalt and the cerium loaded in the catalyst and favors a different reaction pathway, improving the acetaldehyde route by ethanol dehydrogenation, instead of the ethylene route by ethanol dehydration or methane re-adsorption, thus increasing the catalytic activity and selectivity into hydrogen.

【 授权许可】

CC BY   
© 2012 by the authors; licensee MDPI, Basel, Switzerland.